Increased upconversion performance for thin film solar cells: a trimolecular composition

Cheng, Yuen Yap; Nattestad, Andrew; Schulze, T. F.; MacQueen, Rowan W.; Fückel, Burkhard; Lips, K.; Wallace, Gordon G.; Khoury, Tony; Crossley, Maxwell J.; Schmidt, Timothy W.

doi:10.1039/c5sc03215f

Cited by 85 publications

(72 citation statements)

References 80 publications

(114 reference statements)

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“…Details about the experiments and the novel hybrid TTA systems will be published elsewhere soon. 111 .…”

Section: Organic and Dye-sensitized Solar Cellsmentioning

confidence: 99%

“…104 The best results, including our record 2.40 × 10 −3 mA/cm 2 current increase (cf. Table 2) following the implementation of a hybrid-emitter TTA system 20,111 , were obtained with the cuvette filled with Ag-coated beads. Figure 9 shows the history of the FOM obtained with the different classes of devices, as compared to the best result of a thin-film solar cell enhanced with lanthanoid upconversion.…”

Section: Thin-film Silicon Solar Cellsmentioning

confidence: 99%

“…9 History of the figure of merit for thin-film solar cells enhanced by TTA-upconversion as obtained by our group. 47,93,95,96,111 For comparison, the best results for lanthanoid uconversion-enhanced silicon solar cells are shown in grey. 83,86 3.7 TTA-enhanced solar energy storage TTA upconversion hosts great potential for sensitizing photo(electro)chemical (PC/PEC) energy storage, as the respective materials and mechanisms usually have threshold energies well into the visible or even UV range of the spectrum.…”

Section: Thin-film Silicon Solar Cellsmentioning

confidence: 99%

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Photochemical upconversion: present status and prospects for its application to solar energy conversion

Schulze

Schmidt

2015

Energy Environ. Sci.

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507

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All photovoltaic solar cells transmit photons with energies below the absorption threshold (bandgap) of the absorber material, which are therefore usually lost for the purpose of solar energy conversion. Upconversion (UC) devices can harvest this unused sub-threshold light behind the solar cell, and create one higher energy photon out of (at least) two transmitted photons. This higher energy photon is radiated back towards the solar cell, thus expanding the utilization of the solar spectrum. Key requirements for UC units are a broad absorption and high UC quantum yield under low-intensity incoherent illumination, as relevant to solar energy conversion devices, as well as long term photostability. Upconversion by triplet-triplet annihilation (TTA) in organic chromophores has proven to fulfil the first two basic requirements, and first proof-of-concept applications in photovoltaic conversion as well as photo(electro)chemical energy storage have been demonstrated. Here we review the basic concept of TTA-UC and its application in the field of solar energy harvesting, and assess the challenges and prospects for its large-scale application, including the long term photostablity of TTA upconversion materials.

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“…Details about the experiments and the novel hybrid TTA systems will be published elsewhere soon. 111 .…”

Section: Organic and Dye-sensitized Solar Cellsmentioning

confidence: 99%

Section: Thin-film Silicon Solar Cellsmentioning

confidence: 99%

Section: Thin-film Silicon Solar Cellsmentioning

confidence: 99%

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Photochemical upconversion: present status and prospects for its application to solar energy conversion

Schulze

Schmidt

2015

Energy Environ. Sci.

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518

507

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“…Photon upconversion, the conversion of low‐energy light into higher‐energy emission, has a wide variety of applications in the fields of photodynamics therapy solar cell energy conversion, bioimaging, photocatalysis . Among all the existing approaches, photon upconversion via triplet–triplet annihilation (TTA) mechanism is attracting more attention for its various advantages such as noncoherent excitation source and remarkably high efficiency .…”

Section: Introductionmentioning

confidence: 99%

Photon Upconverted Circularly Polarized Luminescence via Triplet–Triplet Annihilation

et al. 2018

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fabrication of CPL-active systems with both large g lum value and high luminescence intensity is of vital importance but remains challenge. Although some chiral lanthanide complexes have been reported to show both high quantum yield and CPL at the same time, it is more common to observe large g lum value accompanied by small luminescence efficiencies in these systems because of the forbidden electric dipole transition, which severely restrict their applications. [8] In contrast to inorganic complexes, purely organic systems seem to be more suitable candidates for CPL study on account of some valuable advantages such as high emission yield, tunable emission wavelengths, and structural variations. [7,9] In spite of relatively low g lum values, various strategies such as encapsulating organic molecules into chiral assemblies [10] or chiral liquid crystals, [11] have been proved to be effective approach for amplifying the g lum values in purely organic systems. In this context, chiral cholesteric liquid crystals have been reported to be able to express high g lum values comparable with that of chiral lanthanide complexes. [12] Recently, we have reported a new example that the g lum value of acceptor molecules could be amplified by energy transfer process in a composite donor-acceptor supramolecular system, which provide a new view to increase the g lum values of purely organic systems. [13] However, in all reported CPLactive systems, a high-energy excitation was required to achieve the circularly polarized emission. On the other hand, photon upconverted systems showing CPL-activity have never been involved.Photon upconversion, the conversion of low-energy light into higher-energy emission, has a wide variety of applications in the fields of photodynamics therapy [14] solar cell energy conversion, [15] bioimaging, [16] photocatalysis. [17] Among all the existing approaches, photon upconversion via triplet-t riplet annihilation (TTA) mechanism is attracting more attention for its various advantages such as noncoherent excitation source and remarkably high efficiency. [18] To date, although photon upconversion has been widely reported, the integration of photon upconversion and CPL in one chiral system to achieve higher-enery CPL emission has never been reported. Herein, we highlight our recent progress on photon upconverted CPL in molecular and assembled systems. Figure 1 illustrates the general idea of this research concept. The triplet excited state (T 1 ) of donor is formed by intersystem crossing (ISC) from singlet excited state. Then, triplet-triplet energy Circularly polarized luminescent materials are of increasing attention due to their potential applications in advanced optical technologies, such as chiroptical devices and optical sensing. Recently, in all reported circularly polarized luminescent materials, high-energy excitation results in lowenergy or downconverted circularly polarized luminescence (CPL) emission. Although photon upconversion-i.e., the conversion of low-energy light into higher-energy em...

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“…3 Several light trapping geometries and plasmonic effects are proposed to enhance the absorption in solar cells. [4][5][6][7][8] The analysis of the performance has to take into account not only the active layer where photogeneration is produced but also the auxiliary layers including electric contacts. These layers are of importance when considering the overall performance of the cell and cannot be neglected or forgotten in the modeling and simulation.…”

Section: Introductionmentioning

confidence: 99%

Funneling and guiding effects in ultrathin aSi-H solar cells using one-dimensional dielectric subwavelength gratings

Elshorbagy

Alda

2017

J. Photon. Energy

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, "Funneling and guiding effects in ultrathin aSi-H solar cells using one-dimensional dielectric subwavelength gratings," J. Photon. Abstract. Ultrathin amorphous silicon hydrogenated (aSi-H) solar cells grown on a one-dimensional (1-D) dielectric subwavelength gratings improve the short circuit current by a factor of more than 51% when compared with conventional, flat ultrathin aSi-H devices. This improvement is possible due to several mechanisms. In addition the increase in exposed area caused by the nanostructured surface, a reliable computational electromagnetic evaluation of the interaction of the solar spectrum with the cell structure demonstrates that absorption at the active layer is enhanced and also reflectivity is decreased. In addition, the absorbed power at the nonactive layers is larger, helping to increase the temperature and mitigate the Staebler-Wronski effect. The detailed analysis of the power flux inside the structure has also shown that funneling and guiding mechanism are at play, increasing the optical path within the active layer that produces a better performance of the cell.

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Increased upconversion performance for thin film solar cells: a trimolecular composition

Abstract: A dual-emitter upconvertor is applied to thin-film solar cells for the first time, generating record figures of merit.

Cited by 85 publications

References 80 publications

Photochemical upconversion: present status and prospects for its application to solar energy conversion

Photochemical upconversion: present status and prospects for its application to solar energy conversion

Photon Upconverted Circularly Polarized Luminescence via Triplet–Triplet Annihilation

Funneling and guiding effects in ultrathin aSi-H solar cells using one-dimensional dielectric subwavelength gratings

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